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How Does Cold Medicine Work?

The cold medicine you picked up at the store involves some cool chemistry to treat your symptoms.

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Sources:
https://www.health.harvard.edu/diseases-and-conditions/common-cold-viral-rhinitis
https://library.med.utah.edu/WebPath/INFLHTML/INFL005.html
http://www.sciencedirect.com/science/article/pii/S1879729614001665?via%3Dihub
http://www.sciencedirect.com/science/article/pii/S1081120610602402?via%3Dihub
https://secure.medicalletter.org/TML-article-1484d
http://www.cochrane.org/CD009345/ARI_antihistamines-common-cold
https://respiratory-research.biomedcentral.com/articles/10.1186/1465-9921-13-98
http://www.tandfonline.com/doi/full/10.3109/01902148.2011.623116
http://www.sciencedirect.com/science/article/pii/S0954611115300640?via%3Dihub
https://www.ncbi.nlm.nih.gov/pubmed/28761581
http://www.sciencedirect.com/science/article/pii/S0163725816000176
https://web.archive.org/web/20121016221008/
http://www.deadiversion.usdoj.gov/drugs_concern/dextro_m/dextro_m.pdf
https://www.ncbi.nlm.nih.gov/pubmed/18253996
https://www.ncbi.nlm.nih.gov/pubmed/15231978

Image Sources:
https://upload.wikimedia.org/wikipedia/commons/thumb/e/e5/%28%2B%29-Pseudoephedrin.svg/2000px-%28%2B%29-Pseudoephedrin.svg.png
https://commons.wikimedia.org/wiki/File:Phenylephrine.png
https://images.rxlist.com/images/rxlist/hycotuss2.gif
https://commons.wikimedia.org/wiki/Category:Dextromethorphan#/media/File:Dextromethorphan_skeletal.png
https://commons.wikimedia.org/wiki/File:Tightjunction_BBB.jpg

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